/Engine/Source/Editor/UnrealEd/Public/Subsystems/BrushEditingSubsystem.h
virtual bool ProcessClickOnBrushGeometry ( [FLevelEditorViewportClient](API\Editor\UnrealEd\FLevelEditorViewportClient) * ViewportClient, [HHitProxy](API\Runtime\Engine\HHitProxy) * InHitProxy, const [FViewportClick](API\Editor\UnrealEd\FViewportClick) & Click )